Screw conveyer



P Z4, 2 J. L. ERISMAN 1,729,211

SCREW CONVEYER Filed. 00%;. 9, 1924 2 Sheets-Sheet l |j'ii 1, FHHHHHHHI 177 Uyzforr J07? 1/ 235857776272 Patented Sept. 24, 1929 UNITED STATES JOHN L. ERISMAN, OF CHICAGO,

PATENT OFFICE ILLINOIS, ASSIGNOR TO H. W. CALDWELL & SON

SCREW CONVEYER Application filed October 9, 1924. Serial No. 742,548.

My invention relates to improvements in screw conveyers. It has for one object to provide a new and improved type of screw conveyer which will result in a minimum destructi'on of bearings and which will increase the capacity of the device.

Experience shows that there is a tendency for the material in the trough to-pile up at the bearing points where the screw is interrupted to permit room for the bearing, and I propose, therefore, to provide means for increasing the capacity of the conveyer at the bearing point so as to prevent this piling up and thereby prevent wear of the bearing.

Vhat happens is that in the normal operation the screw moves the material along to the trough in a steady stream. At the points where the screw is interrupted to make a place for the bearing, the material piles up until the pile is high enough so that the material fed to the pile will run down by gravit v across the gap to the point where the flight on the next section of screw can get at it. This pile is frequently higher than the bearing, and therefore the bearing is exposed to direct contact with the piled up material.

I propose to terminate each bearing section with a double screw element, thus increasing the capacity of the screw at that point and providing means for projecting the material across the gap and keeping the pile of material down.

In general, my device comprises in one form a hollow screw shaft with the spiral flight wound about. There is a manganese stub shaft between the ends of each such power shaft and flight, and this manganese shaft rotates in the bearing. Associated with These collars preferably overlie part of the bearing sleeve and each collar has one or more spiral paddles 0r segmental flights thereon, there being but a single paddle on the hollow shaft. These two flights mayor may not this manganese stub shaft are two collars.

have different angles of inclination from the balance of the screw, and they can be arranged to pro ectthe material across the gap without difficulty and therefore carry the material continuously and protect the bearmg.

The invention is illustrated more or iess diagrammatically in the drawings. wherein-.

Figure 1 isa perspective view of the conveyer screw in its assembled position;

Figure 2- is a similar view showing the arrangement partially disassembled;

accompanying Figure 3 is an end elevation of one of the and its associated parts, because they form no part of the present mvention and would add nothing to the clearness of the device.

A is a supporting bracket which may be mounted on the trough or near the suitable supporting or anchoring means. This supporting bracket contains a. two-part or split bearing sleeve A This bearing sleeve has an inner cylindrical bearing surface to en gage the stub end shaft A The opposed ends of the sleeve A are reduced as at A A is a hollow shaft mounted on the stub shaft A it carries a spiral conveyer flight or screw A wound about its periphery in the usual manner, this flight terminating at each end of the shaft A B is an end flight sleeve cupped to surround the reduced portion ofthe sleeve A and adapted to be keyed or otherwise fastened on the stub shaft A and will abut snugly against the shaft A On this end flight sleeve are a plurality of segmental end flight paddles or screws B B These end flight screws are of substantially the same diameter as the screws A and extend toward the ends of the shaftclear up until adjacent to the plane of the end of the end flight sleeve B. Thus they somewhat overhang the actual bearing surface in which the stub shaft is carried.

I have not illustrated means for driving the shaft or means for feeding material to the trough, as this forms, also, no part of my invention.

When the device is in operation, the entire series of separate hollow shafts are rotated in unison; material fed to the trough at any point is carried forward along the bottom of the trough by the spiral action of the members A and as the material reaches the point at which the single spiral terminates it is caught by the end flight paddles or screws and thrown across the gap occasioned by the bearing, until it is caught by the end flight screws on the other side of the bearing and delivered by them to the normal spiral.

It will be evident that while I have shown in my drawings an operative device, still many changes might be made in the size, shape and arrangement of parts without departing from the spirit of my invention. I wish, therefore, that my drawings be regarded as in a sense diagrammatic.

While I have referredto the shaft as being hollow, it might, of course, be solid. I have also referred to the stub shaft as made of manganese and while for some surposes this is preferable, many other materials might be used. In the figures, I show on each of the collars two flights. One only might be used or more than two might be used.

I claim:

1. In a screw conveyer, a plurality of separate screw sections, bearings interposed between them, means associated therewith for conveying material across the gap occasioned by the bearing, said means comprising a plurality of segmental screw paddles arranged adjacent the bearing, the angle of inclination of said paddles being different from the angle of inclination of the spiral on the shaft.

2. In a screw conveyer, a plurality of separate screw sections, a bearing interposed between them and means associated therewith for conveying material across the gap occasioned by the bearing and for protecting the bearing, said means comprising a plurality of "up-shaped members, each adapted to engage one of the screw sections and to over-hang the bearing, and each carrying a plurality of segmental screw paddles arranged adjacent the bearing.

3. In a screw conveyer, a plurality of separate screw sections, a bearing interposed between them and means associated therewith for conveying material across the gap occasioned by the bearing and for protecting the bearing. said means comprising a plurality of cup-shaped members, each adapted to en JOHN L. ERISMAN. 

